SEATTLE, WA -- (MARKET WIRE) -- April 3, 2007 -- Global supercomputer leader Cray Inc. (NASDAQ: CRAY) today announced that a recently upgraded Cray XT4™ supercomputer
at Oak Ridge National Laboratory (ORNL) has set a new performance record
for the Weather and Research Forecast (WRF) meteorological modeling
software. ORNL's Cray XT4 system, nicknamed "Jaguar," ran the advanced WRF
code on a total of 12,500 processors, achieving sustained performance that
reached an unprecedented 7.1 teraflops (trillion floating point operations
per second). At this level of performance, scientists can generate a
one-day, 2.5-kilometer-resolution weather forecast covering the entire
continental United States in as little as 18 minutes, compared to the
several hours it would take on a less efficient system.

"The expanded Cray XT4 Jaguar supercomputer provides a world-class platform
for high-impact scientific research," said John Drake, ORNL's chief
computational climate scientist. "The system offers exceptional performance
that allows researchers at ORNL to tackle some of the most formidable
challenges in climate modeling, materials science, fusion energy and other
important scientific studies."

The Jaguar system at ORNL is the largest supercomputer in the Department of
Energy (DOE) Office of Science, and is the major computing resource for
DOE's Innovative and Novel Computational Impact on Theory and Experiment,
or INCITE, program. ORNL increased the system's computing power to 54
teraflops in mid-2006, making it one of the most powerful open scientific
systems in the world.

"The Cray XT™ infrastructure is designed for upgradeability, so
customers can dramatically increase the number and speed of compute
operations without having to purchase a new system or change their software
configurations," said Per Nyberg, Cray's Earth Sciences Segment director.
"The Jaguar system at ORNL demonstrates how this scalable architecture can
be leveraged to provide unprecedented levels of sustained performance for
key scientific applications such as WRF. Increasing our ability to predict
and prepare for extreme weather events is sure to yield important benefits
for society and the world economy."

About WRF

WRF is a next-generation numerical weather prediction application employed
by a large global community of users to conduct weather research and
provide operational forecasting at scales ranging from meters to thousands
of kilometers. The WRF code was developed as part of a collaborative
partnership among the National Center for Atmospheric Research, the
National Oceanic and Atmospheric Administration, the National Centers for
Environmental Prediction, the Forecast Systems Laboratory, the Air Force
Weather Agency, the Naval Research Laboratory, Oklahoma University and the
Federal Aviation Administration. Scientists are using WRF to solve problems
in the areas of regional climate modeling, hurricane forecasting, tropical
convection and fundamental dynamics of the atmosphere. For example, by
resolving uncertainties about the nature of convection currents in the
tropics, researchers will be able to construct more accurate global models
aimed at predicting weather and climate patterns in higher latitudes. Go to
www.wrf-model.org for more information.

About Oak Ridge National Laboratory

Located in Oak Ridge, Tennessee, ORNL is the U.S. Department of Energy's
largest science and energy laboratory, with over 4,000 researchers and
support staff. ORNL is an international leader in research areas that
include neutron science, new energy sources, high-performance computing,
biological systems, nanoscale materials science and national security. ORNL
is home to the Center for Functional Genomics, the Center for Nanophase
Materials Sciences and a number of other research facilities. The
laboratory was selected as the site of the Office of Science's National
Leadership Computing Facility, whose goal is to build the world's fastest
supercomputer for unclassified research. Go to www.ornl.gov for more
information.

About the Cray XT4 Supercomputer

Building on the success of the Cray XT3™ system, the Cray XT4 is a
massively parallel processor (MPP) supercomputer purpose-built to deliver
exceptional sustained application performance for challenging scientific
and engineering problems. The supercomputer's high-speed 3D torus
interconnect, advanced MPP operating system and high-speed global
input/output make it possible for users to scale applications from 200 to
more than 30,000 processors without performance loss. The system's scalable
processing element uses x86 64-bit AMD Opteron™ single- or dual-core
processors that employ HyperTransport™ technology to increase bandwidth
and reduce latency. Go to www.cray.com/products/xt4/index.html for more
information.

About Cray Inc.

As a global leader in supercomputing, Cray provides highly advanced
supercomputing systems and world-class services and support to government,
industry and academia. Cray technology enables scientists and engineers to
achieve remarkable breakthroughs by accelerating performance, improving
efficiency and extending the capabilities of their most demanding
applications. Cray's Adaptive Supercomputing vision will result in
innovative next-generation products that integrate diverse processing
technologies into a unified architecture, allowing customers to surpass
today's limitations and meeting the market's continued demand for realized
performance. Go to www.cray.com for more information.

Cray is a registered trademark, and Cray XT, Cray XT4 and Cray XT3 are
trademarks, of Cray Inc. Opteron is a trademark of Advanced Micro Devices,
Inc. HyperTransport is a licensed trademark of the HyperTransport
Technology Consortium. All other trademarks are the property of their
respective owners.